In Part 1 of this teardown, we saw what may be the return of Android@Home, or at least something similar. There were also new pieces to Nearby, Google's unique technology for finding two devices (and people) in close proximity, and a possible (subtle) change to the way Smart Lock responds to wearable devices. In Part 2, we'll continue with the possible centralization of Chrome Sync to Play services, project Sidewinder, a mysterious appearance by Facebook, and more.

The presence of Google+ is definitely growing as it continues to become a significant part of how we interact with many of Google's services. Early this year, the social network branched out to become a sign-in solution for virtually any kind of app or website. With an announcement yesterday, Google+ is now set up to accept sign-ins from Google Apps users and accounts without an actual Google+ profile. If that weren't good enough, the permission system has been greatly improved to support "incremental auth," which allows apps and websites to request only vital permissions to begin using them, and then ask for new permissions once the user is logged in.

It was a little over a month ago that Google introduced Google+ Sign-In. The basic idea being the same as it is with Facebook and Twitter: use one account to access all your sites. So, what makes this different from those other networks? Well, allegedly this will result in less social spam and a better integrated experience. Oh, and also, now that Mountain View has signed deals with Janrain and Gigya, the big red button should be just about everywhere on the internet.

Google, in a bid toward continued competition with the other social networks, today announced Google+ Sign-In, a unified login that can be utilized across the web, as well as Android and iOS apps to make sign-in and sharing much simpler. Think Facebook connect but, in Google's words, "minus the social spam."

Google, in a post to the Google+ Developers Blog, emphasized four key points of focus for Sign-In's first release, the first of which being the idea that "simplicity and security come first." Basically, the sign-in process will work like that of Facebook – choose your G+ account, review the permissions the website or app wants access to, approve, and you're set.

As Google+ continues to get better, it's only inevitable that it'll start showing up in more and more places. And Google intends for that to happen as soon as possible, from the looks of it - Mountain View just announced its Google+ Developer Platform.

The Google+ SDK, which should be available "in the coming weeks," will allow Android app developers to integrate G+ into their products more seamlessly.